package com.xr.elm.filter;


import com.alibaba.fastjson.JSON;
import com.xr.elm.common.BaseContext;
import com.xr.elm.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器,支持通配符
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
       HttpServletRequest request= (HttpServletRequest) servletRequest;
       HttpServletResponse response= (HttpServletResponse) servletResponse;

//        1、获取本次清求的R
        String requestURI = request.getRequestURI();
        log.info("拦截到请求路径：{}",requestURI);
        //定义不需要处理得请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
//        2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
//        3、如果不需要处理，则直接放行
        if (check){
            log.info("本次登陆不需要处理：{}",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
//        4、判断登录状态，如果己登录，则直接放行
        if (request.getSession().getAttribute("employee")!= null){
            log.info("用户已登陆，登陆id为：{}",request.getSession().getAttribute("employee"));
            Long empId= (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }

        //        4-2、判断移动端登录状态，如果己登录，则直接放行
        if (request.getSession().getAttribute("user")!= null){
            log.info("用户已登陆，登陆id为：{}",request.getSession().getAttribute("user"));
            Long userId= (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登陆");
//        5、如果未登录则返回未登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    public boolean  check(String[] urls,String requestURI){
        for (String url : urls) {
           boolean  match= PATH_MATCHER.match(url,requestURI);
           if (match){
               return true;
           }
        }
        return false;
    }
}
